A. Tognazzi, P. Franceschini, O. Sergaeva, L. Carletti, Ivano Alessandri, G. Finco, Osamu Takayama, R. Malureanu, Andrei V. Lavrinenko, Alfonso C. Cino, Domenico de Ceglia, Costantino De Angelis
{"title":"Giant photoinduced reflectivity modulation of nonlocal resonances in silicon metasurfaces","authors":"A. Tognazzi, P. Franceschini, O. Sergaeva, L. Carletti, Ivano Alessandri, G. Finco, Osamu Takayama, R. Malureanu, Andrei V. Lavrinenko, Alfonso C. Cino, Domenico de Ceglia, Costantino De Angelis","doi":"10.1117/1.ap.5.6.066006","DOIUrl":"https://doi.org/10.1117/1.ap.5.6.066006","url":null,"abstract":"","PeriodicalId":33241,"journal":{"name":"Advanced Photonics","volume":"2 12","pages":""},"PeriodicalIF":17.3,"publicationDate":"2023-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138585960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Surfing the metasurface: a conversation with Din Ping Tsai","authors":"Guoqing Chang","doi":"10.1117/1.ap.5.6.060502","DOIUrl":"https://doi.org/10.1117/1.ap.5.6.060502","url":null,"abstract":"","PeriodicalId":33241,"journal":{"name":"Advanced Photonics","volume":"36 5","pages":""},"PeriodicalIF":17.3,"publicationDate":"2023-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139251116","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We review the physics and some applications of photonic structures designed for the realization of strong nonlinear chiroptical response. We pay much attention to the recent strategy of utilizing different types of optical resonances in metallic and dielectric subwavelength structures and metasurfaces, including surface plasmon resonances, Mie resonances, lattice-guided modes, and bound states in the continuum. We summarize earlier results and discuss more recent developments for achieving large circular dichroism combined with the high efficiency of nonlinear harmonic generation.
{"title":"Nonlinear chiral metaphotonics: a perspective","authors":"Kirill Koshelev, Pavel Tonkaev, Yuri Kivshar","doi":"10.1117/1.ap.5.6.064001","DOIUrl":"https://doi.org/10.1117/1.ap.5.6.064001","url":null,"abstract":"We review the physics and some applications of photonic structures designed for the realization of strong nonlinear chiroptical response. We pay much attention to the recent strategy of utilizing different types of optical resonances in metallic and dielectric subwavelength structures and metasurfaces, including surface plasmon resonances, Mie resonances, lattice-guided modes, and bound states in the continuum. We summarize earlier results and discuss more recent developments for achieving large circular dichroism combined with the high efficiency of nonlinear harmonic generation.","PeriodicalId":33241,"journal":{"name":"Advanced Photonics","volume":"32 44","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135390983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The Nobel Prize in Physics 2023 was awarded to Pierre Agostini, Ferenc Krausz and Anne L’Huillier for “experimental methods that generate attosecond pulses of light for the study of electron dynamics in matter.” We review the history of attosecond physics, recount the laureates’ achievements and their place within the field, discuss the breakthroughs made possible by the creation of attosecond pulses, and look to the future advances in attoscience.
{"title":"Shining the shortest flashes of light on the secret life of electrons","authors":"Margarita Khokhlova, Emilio Pisanty, Amelle Zaïr","doi":"10.1117/1.ap.5.6.060501","DOIUrl":"https://doi.org/10.1117/1.ap.5.6.060501","url":null,"abstract":"The Nobel Prize in Physics 2023 was awarded to Pierre Agostini, Ferenc Krausz and Anne L’Huillier for “experimental methods that generate attosecond pulses of light for the study of electron dynamics in matter.” We review the history of attosecond physics, recount the laureates’ achievements and their place within the field, discuss the breakthroughs made possible by the creation of attosecond pulses, and look to the future advances in attoscience.","PeriodicalId":33241,"journal":{"name":"Advanced Photonics","volume":"535 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135637377","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Advanced Photonics, co-published by SPIE and Chinese Laser Press, is a highly selective, Gold Open Access, international journal publishing innovative research in all areas of optics and photonics, including fundamental and applied research.
{"title":"Compact multi-mode silicon-nitride micro-ring resonator with low loss","authors":"Kaixuan Ye, David Marpaung","doi":"10.1117/1.ap.5.5.050503","DOIUrl":"https://doi.org/10.1117/1.ap.5.5.050503","url":null,"abstract":"<i>Advanced Photonics</i>, co-published by SPIE and Chinese Laser Press, is a highly selective, Gold Open Access, international journal publishing innovative research in all areas of optics and photonics, including fundamental and applied research.","PeriodicalId":33241,"journal":{"name":"Advanced Photonics","volume":"64 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135321461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shujun Liu, Ruitao Ma, Zejie Yu, Yaocheng Shi, Daoxin Dai
Abstract. A silicon-based digitally tunable positive/negative dispersion controller (DC) is proposed and realized for the first time using the cascaded bidirectional chirped multimode waveguide gratings (CMWGs), achieving positive and negative dispersion by switching the light propagation direction. A 1 × 2 Mach–Zehnder switch (MZS) and a 2 × 1 MZS are placed before and after to route the light path for realizing positive/negative switching. The device has Q stages of identical bidirectional CMWGs with a binary sequence. Thus the digital tuning is convenient and scalable, and the total dispersion accumulated by all the stages can be tuned digitally from − ( 2Q − 1 ) D0 to ( 2Q − 1 ) D0 with a step of D0 by controlling the switching states of all 2 × 2 MZSs, where D0 is the dispersion provided by a single bidirectional CMWG unit. Finally, a digitally tunable positive/negative DC with Q = 4 is designed and fabricated. These CMWGs are designed with a 4-mm-long grating section, enabling the dispersion D0 of about 4.16 ps / nm in a 20-nm-wide bandwidth. The dispersion is tuned from −61.53 to 63.77 ps / nm by switching all MZSs appropriately, and the corresponding group delay is varied from −1021 to 1037 ps.
{"title":"On-chip digitally tunable positive/negative dispersion controller using bidirectional chirped multimode waveguide gratings","authors":"Shujun Liu, Ruitao Ma, Zejie Yu, Yaocheng Shi, Daoxin Dai","doi":"10.1117/1.AP.5.6.066005","DOIUrl":"https://doi.org/10.1117/1.AP.5.6.066005","url":null,"abstract":"Abstract. A silicon-based digitally tunable positive/negative dispersion controller (DC) is proposed and realized for the first time using the cascaded bidirectional chirped multimode waveguide gratings (CMWGs), achieving positive and negative dispersion by switching the light propagation direction. A 1 × 2 Mach–Zehnder switch (MZS) and a 2 × 1 MZS are placed before and after to route the light path for realizing positive/negative switching. The device has Q stages of identical bidirectional CMWGs with a binary sequence. Thus the digital tuning is convenient and scalable, and the total dispersion accumulated by all the stages can be tuned digitally from − ( 2Q − 1 ) D0 to ( 2Q − 1 ) D0 with a step of D0 by controlling the switching states of all 2 × 2 MZSs, where D0 is the dispersion provided by a single bidirectional CMWG unit. Finally, a digitally tunable positive/negative DC with Q = 4 is designed and fabricated. These CMWGs are designed with a 4-mm-long grating section, enabling the dispersion D0 of about 4.16 ps / nm in a 20-nm-wide bandwidth. The dispersion is tuned from −61.53 to 63.77 ps / nm by switching all MZSs appropriately, and the corresponding group delay is varied from −1021 to 1037 ps.","PeriodicalId":33241,"journal":{"name":"Advanced Photonics","volume":"25 1","pages":"066005 - 066005"},"PeriodicalIF":17.3,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139293781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Improving the spatial resolution of a fluorescence microscope has been an ongoing challenge in the imaging community. To address this challenge, a variety of approaches have been taken, ranging from instrumentation development to image postprocessing. An example of the latter is deconvolution, where images are numerically deblurred based on a knowledge of the microscope point spread function. However, deconvolution can easily lead to noise-amplification artifacts. Deblurring by postprocessing can also lead to negativities or fail to conserve local linearity between sample and image. We describe here a simple image deblurring algorithm based on pixel reassignment that inherently avoids such artifacts and can be applied to general microscope modalities and fluorophore types. Our algorithm helps distinguish nearby fluorophores, even when these are separated by distances smaller than the conventional resolution limit, helping facilitate, for example, the application of single-molecule localization microscopy in dense samples. We demonstrate the versatility and performance of our algorithm under a variety of imaging conditions.
{"title":"Resolution enhancement with deblurring by pixel reassignment","authors":"Bingying Zhao, Jerome Mertz","doi":"10.1117/1.ap.5.6.066004","DOIUrl":"https://doi.org/10.1117/1.ap.5.6.066004","url":null,"abstract":"Improving the spatial resolution of a fluorescence microscope has been an ongoing challenge in the imaging community. To address this challenge, a variety of approaches have been taken, ranging from instrumentation development to image postprocessing. An example of the latter is deconvolution, where images are numerically deblurred based on a knowledge of the microscope point spread function. However, deconvolution can easily lead to noise-amplification artifacts. Deblurring by postprocessing can also lead to negativities or fail to conserve local linearity between sample and image. We describe here a simple image deblurring algorithm based on pixel reassignment that inherently avoids such artifacts and can be applied to general microscope modalities and fluorophore types. Our algorithm helps distinguish nearby fluorophores, even when these are separated by distances smaller than the conventional resolution limit, helping facilitate, for example, the application of single-molecule localization microscopy in dense samples. We demonstrate the versatility and performance of our algorithm under a variety of imaging conditions.","PeriodicalId":33241,"journal":{"name":"Advanced Photonics","volume":"68 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136235000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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